National Natural Science Foundation of China (NSFC)
31870736
中国
引用
ジャーナル: J Struct Biol / 年: 2022 タイトル: Cryo-EM structure of AMP-PNP-bound human mitochondrial ATP-binding cassette transporter ABCB7. 著者: Qinqin Yan / Yuequan Shen / Xue Yang / 要旨: ATP-binding cassette subfamily B member 7 (ABCB7) is localized in the inner membrane of mitochondria, playing a critical role in iron metabolism. Here, we determined the structure of the ...ATP-binding cassette subfamily B member 7 (ABCB7) is localized in the inner membrane of mitochondria, playing a critical role in iron metabolism. Here, we determined the structure of the nonhydrolyzable ATP analog adenosine-5'-(β-γ-imido) triphosphate (AMP-PNP) bound human ABCB7 at 3.3 Å by single-particle electron cryo-microscopy (cryo-EM). The AMP-PNP-bound human ABCB7 shows an inverted V-shaped homodimeric architecture with an inward-facing open conformation. One AMP-PNP molecule and Mg were identified in each nucleotide-binding domain (NBD) of the hABCB7 monomer. Moreover, four disease-causing missense mutations of human ABCB7 have been mapped to the structure, creating a hotspot map for X-linked sideroblastic anemia and ataxia disease. Our results provide a structural basis for further understanding the transport mechanism of the mitochondrial ABC transporter.